16 Years Later, 'Mad Men's Best Quote Completely Defines the Series

Season 4 of Mad Mensaw a makeover for the critically acclaimed AMC period drama. With a new office, new partners, and new employees, Don Draper's (Jon Hamm) advertising kingdom underwent the same turbulence as the ongoing political and social movements of the 1960s. Inside the new quarters of Sterling Cooper Draper Pryce, the independent offshoot of Sterling Cooper, the rising star was undoubtedly Peggy Olson (Elisabeth Moss), who fully transformed from a timid secretary to a creative visionary in the copy division. Peggy also became Don's ultimate foil, and the pair's dynamic relationship, the heart of Mad Menin its later seasons, culminated in Season 4, Episode 7, "The Suitcase," widely regarded as the show's high point.